It's all been said here already, really.
The thing is, I'm prepared to believe that the Winkers had the best concept (though it does nothing for me), but that's the basis for a one-off programme, not an 8-part series (or maybe a different series where 8 couples who want to open a restaurant go through various food-related sales & marketing tasks.)
But this was like a detective story where the hero spenRAB 85 minutes following clues to track down the killer, and in the last 5 minutes bumps into him in the street by accident. It's not necessarily unrealistic, but it's fundamentally a poor story, and that's what we had here.
There's that old saying - "When the only tool you have is a hammer, after a while everything starts to look like a nail." That's the Winkers with their cocktails, the universal cure-all for every situation.
Best episode of this series though, stupid result notwithstanding. Definitely won't be watching again, au revoir Raymond.